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MathNet 2008-part-03 — 165 problems (EN–VI) Question 25

Math Olympiad Vault · MathNet 2008-part-03 — 165 problems (EN–VI)

Question 25

Let $1*2*3*4*5*6*7*8*9=0$ be a given equality. Is it possible to substitute some of the $*$ with $+$ and the others with $-$ to obtain a correct equality?